mainyoudaoicibaDictYouDict[main 词源字典]
main: [OE] Main goes back to prehistoric Germanic *mag- ‘be able, have power’ (source also of English may and might, and distantly related to machine). From it was descended Old English mægen ‘strength’. This now survives as a noun only in the expression with might and main, but it was also used attributively in Old English to mean ‘of large size, great’, and by the 13th century (helped along partly by the related Old Norse megenn or megn ‘strong’) it was being used as an adjective in its own right. At first it still meant just ‘large’, but by the 15th century its modern sense ‘chief’ had evolved.
=> may, might[main etymology, main origin, 英语词源]
AscotyoudaoicibaDictYouDict
village near Windsor, Berkshire; site of fashionable race-meeting. Used attributively for clothes suitable for the event; especially a type of tie (1908). The town name is literally "eastern cottage."
attributive (adj.)youdaoicibaDictYouDict
c. 1600, from French attributif, from stem of Latin attributus (see attribute (v.)). As a noun, in grammar, from 1750. Related: Attributively; attributiveness.
Bayard (n.)youdaoicibaDictYouDict
generic or mock-heroic name for a horse, mid-14c., from Old French Baiard, name of the bay-colored magic steed given by Charlemagne to Renaud in the legends, from Old French baiart "bay-colored" (see bay (adj.)). Also by early 14c. proverbial as a blind person or thing, for now-unknown reasons. The name later was used attributively of gentlemen of courage and integrity, in this sense from Pierre du Terrail, seigneur de Bayard (1473-1524), French knight celebrated as Chevalier sans peur et sans reproche. The surname is perhaps in reference to hair color.
don juan (n.)youdaoicibaDictYouDict
"philanderer," from the legendary dissolute Spanish nobleman whose rakish exploits formed the stuff of popular tales in Spain from early 17c., dramatized by Gabriel Tellez in "Convivado de Piedra." Adapted into French and Italian before 1700; Used attributively in English for "ladies' man, womanizer" from the time of Byron's popular poem about him (1819).
gun-metal (n.)youdaoicibaDictYouDict
type of bronze or other alloy formerly used in the manufacture of light cannons (since superseded by steel), 1540s, from gun (n.) + metal. Used attributively of a dull blue-gray color since 1905.
inkhorn (n.)youdaoicibaDictYouDict
late 14c., "small portable vessel (originally made of horn) for holding ink," from ink (n.) + horn (n.). Used attributively as an adjective for things (especially vocabulary) supposed to be beloved by scribblers and bookworms (1540s). An Old English word for the thing was blæchorn.
rock (n.1)youdaoicibaDictYouDict
"stone, mass of mineral matter," c. 1300, from Old English rocc (as in stanrocc "stone rock or obelisk") and directly from Old North French roque, which is cognate with Medieval Latin rocca (8c.), from Vulgar Latin *rocca, of uncertain origin, according to Klein sometimes said to be from Celtic (compare Breton roch).

In Middle English it seems to have been used principally for rock formations as opposed to individual stones. Meaning "precious stone, especially a diamond," is 1908, U.S. slang. Meaning "crystallized cocaine" is attested from 1973, in West Coast U.S. slang. Figurative use for "sure foundation" (especially with reference to Christ) is from 1520s; but also from 1520s as "source of danger or destruction," in reference to shipwrecks (as in on the rocks). Also used attributively in names of animals that frequent rocky habitats, as in rock lobster (1843). Between a rock and a hard place first attested 1921:
to be between a rock and a hard place, vb. ph. To be bankrupt. Common in Arizona in recent panics; sporadic in California. ["Dialect Notes," vol. V, part iv, 1921]
Rock-ribbed is from 1776, originally of land; figurative sense of "resolute" first recorded 1887. Rock-happy (1945) was U.S. Pacific Theater armed forces slang for "mentally unhinged after too much time on one island." The rock-scissors-paper game is attested by that name from 1976; from 1968 as paper-stone-scissors. A 1967 source says it is based on Japanese Jan Ken Pon (or Janken for short), which is said to mean the same thing more or less.
rococo (adj.)youdaoicibaDictYouDict
1836, "old-fashioned," from French rococo (19c.), apparently a humorous alteration of rocaille "shellwork, pebble-work" from Middle French roche "rock," from Vulgar Latin *rocca "stone." Specifically of furniture or architecture of the time of Louis Quatorze and Louis Quinze, from 1841. If this is correct, the reference is to the excessive use of shell designs in this lavish style. For differentiation, see baroque. The general sense of "tastelessly florid or ornate" is from 1844.
Much of the painting, engraving, porcelain-work, etc., of the time has ... a real decorative charm, though not of a very high order in art. Hence rococo is used attributively in contempt to note anything feebly pretentious and tasteless in art or literature. [Century Dictionary, 1902]
gallusyoudaoicibaDictYouDict
"Bold, cheeky, or flashy", Late Middle English (in the sense 'fit to be hanged'): variant of gallows used attributively.